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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16a33dbedb6da8fb13d1615802dc831292b6e457e534f2a40f64b4e591b3429a' 
  AND token = 'O1LVBOsyrnvlS4CbgTCWz8ZTgP2oC1MzEJ5++kv5kck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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