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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '664aca188cd2405b4f334ab1448e532f00ffcbb9a1282ee26e10326172fe10e1' 
  AND token = 'o9YlCcLCtk7h+9hOG0ue5LSGZsjNG9ZgM7G1BYeeF8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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