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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dae39569ba6f2e14ad285c2c5c5522614099e66c299a1e85f7c216126f5ecea9' 
  AND token = 'hCosIMgexSKhXm+OqIFUMv192gskZnPU4+t5n+BQyns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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