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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66b7d56f5fa943855603c4feb6c5713e12c67d856b57501af756f5a635c27056' 
  AND token = 'KLNnJN00k04Pi1I5mgy/gb8u7BBkpAZO17lKlwC80w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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