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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6be53fab49bcedacfe70715bd7ef75d455e43364b9d1915516705ac45179661e' 
  AND token = 'F0rM/bi+qg0Apoyec2v6IuSlv1X7kceZrsxBx1JmC3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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