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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7765ae21b05fca65e35d1811e362a8d831751a25d5a2b065749ef86bd1becc5' 
  AND token = 'bhErIFutekGz1XY1im+lOiswk3fHprCoi60Zbhbt0rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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