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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25e8d93168d92c6c48c4f1b6109a3f9ee1e0f6437dbd3f9b508a1f37034461be' 
  AND token = 'iXjbI2pEzSG6IpLQCd5mj6QcfBjWg8paSEbDXsLE6rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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