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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '021cc93cdfc34199d94c7a59962611d0bee6e226bb0672d13bb89bf982d53e24' 
  AND token = 'AvuvNRpmkKxndaJ1a7eC6OgwOVl5II7aVpW04oUYa1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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