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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f419a686c5de4a91a9bf2184cb7b43fef61b35d8552791ebcda51ba55117bdf6' 
  AND token = 'tmw5ppbsHazFCxMw98NZwcz10lE8ozm/ch2X6UHFR40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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