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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f172240f58a8b9373d9f5714cda923226991e9974f14a5b0817e984e417d427' 
  AND token = 'T3GBJ+TKIwDRO9vBXlG2rx0TPR3aTu7DmTX/gk3Tckc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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