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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ef9826e2ef74a60b0741dcbe1467ee6b0c4e143fe51d54cc4f7838609251e50' 
  AND token = '5WIkRSgj25kCXwsmg/r/TP1VOfuiGwcbonp5B9vUaTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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