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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e3b501dab0e088be0537ca2093e4181b4e9d0686721ea30ed9682111272573d' 
  AND token = '8URqncEDZiHNkdwtKOg56dj9Q17Ks7AfcsQa3KqNZ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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