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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '223dd04e19fd1c3d3c0097ed866b2eaf6d0adfa456a15825c0395fbc08ec8e5d' 
  AND token = 'dnFKA9ohSLQzuH8Jhkv08zX4+cBOFHXuQmvNULJLe9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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