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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cc08affa925d81d49cb95e8e22d0410f6c3aef8956f722a3a5da60b9d0652c9' 
  AND token = 'k4fX6mcdKkoEkpkEQHmCTx50HtSODXWRQ/LinLdXkFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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