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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '145fa5596bfa951268308a615304eac1ff44fe42e43b0ae660b5cf0fdeea9c5f' 
  AND token = 'y9emLOFSW2D0B8/NtellXZBq6cEusFer85UyPtcO4y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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