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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32efb4e47a206383ce4390ebe6e754d6c9cd9a00fa32b6b64a76b5d715810863' 
  AND token = 'CVqyZLY0L1JTtmkrrj3LqCoAQ6+CnxZVr9qAeIERx6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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