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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27ddaf42cda3a4dc30d84ca6cd50c82b945cdca09ad061076211e0d9973804e1' 
  AND token = 'lNTdg4MLLxF2Ns0AnaC6gIk7aILJJ4VcYP6aXxpiWxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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