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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ba9f5454f2a04c98dd4ed59b162c263256d2091f85fad190386f565d0e0d8c5' 
  AND token = 'nyFx8JwUxD81wA9SZYABpBxWXY7jeY99e7Prl7wCtjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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