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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1c14902c2d3ea1493bcf3c452c6e728a7aa0839914602158c735601b5170cc7' 
  AND token = 'ZrlBkjT75+/h8wAQwtpwOkJVt04Pcq2e0EVOfrcxZIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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