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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c5f52fd2fed4b8896c8e56762e4010bff87dac6fd6cc222e46534782537b4fe' 
  AND token = 'lIDN+JMyQD6/DCJCXaImm1XE7zquaix10qz7GEOpl/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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