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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee690bab65b798706fc949e31d5e7903e9be8b697db6735f133888a7cf40b3a1' 
  AND token = '587qYmkBij35GDuw0gBnd3zeJlJ6yN523QtlCC5t46Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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