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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea2badddb0340ed6d8a900e0245496312370bffa8686357a7cec9f5194977efc' 
  AND token = 'r5T61zd0dxZpplo7ARI5pjWxQLjIsxR+Wqq35SrGR2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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