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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6894019736f37edd4f69b87e286433a8c0fe1fb4ebe51259ea68d0a333620430' 
  AND token = '7s7prSPHJe96IzL1wjZ5MmaKlZs/X+1139CqeyH7J00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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