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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9589e46de9b2f8268f04d9e14a167df9254ad229ca322f9ca09bc19e7c76021' 
  AND token = 'uEbNEtmJDXiMSbgNQwH2QNH5LI6w/uY+Um4o3LGXG7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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