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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8772ae052262a87048f8c759a9d5401ad6f51bf5f459c28129ea1e1fb57d80d' 
  AND token = 'd25rYVNNTFa6xaX9dZj3MK0ylefUc2Oiv9U6EMQjz5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}