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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40b296cc67b0016f238a27b7578119a6b248cef131eab30197895b9646e7d64f' 
  AND token = 'f1dx1lE5mqyo2Xmf3tEgT3q3Bj2e90yHRH5ha/X8Q+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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