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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e93e5ac052845c96dc1cdf5fbfe651e36a0d6bcf6d1d0938a4684b8e375567e' 
  AND token = 'I4vW3QwJcGLzkWVhxPLDaYL7805ovhmaQyhbF4ODvDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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