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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4fb24e0dd670d85f43bf71529d22cae9d62c532435052327edf443f14fe7a02' 
  AND token = '1NMbPwMpEL4nMk5HJcnXd7K3XehCbH9lFjr0zMhX8ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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