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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd19b53ea7af57a8b101e46c0a41e280dc093ab065294ff5eee0c417f6b9863e' 
  AND token = 'OLqnrhLTtsMF3OAUxcbGJWyd/ezd1p7vH+uEm6HxKk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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