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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1c6bfa4292c23079ccc66f7ec22083411ac3af75a83af89582a126333607c56' 
  AND token = 'w2rhfYtHNsrCKi6eXWms0H0lr4rEfDgmLZGsMPjIbtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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