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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52ad812d450b4e47bdedc73354311c6099fc9d708d8fb8fb0e0f7bca57664f0d' 
  AND token = 'xmo83nAPwU7Eqmn0G0o8RMAR+qGj/M3YLQ7Ft5LJkos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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