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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bddf6d5a258ae8c62e74f61ccc9beb3c45a53e85ce2d935079e66e3bb1425ffb' 
  AND token = 'vjCKUP/+VUAaqSsW3vj3Ou697xnfCeuv7lq1cHN9ETI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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