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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '504027b5883e825c3735210b22969f5e5461f4c5f8db2b9310a9cd0770d2c164' 
  AND token = 'gytgIGxg6KDHgkoa7T8xgrqqe1SvfpHlbaUg31l/YxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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