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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa0881e893480875c382627a83ef395f74a1cfa8a6e48db61bfaceca2cb5e474' 
  AND token = '2DqHVigtAGmmwhcTffkldNR6EinA4vxQnpoRDp9+5K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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