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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98b373300c4c0f4267ea172341e47d3eaadc6333e55d6943a544f628eb6797e4' 
  AND token = 'fozcrWR63/6+HoijEPE0iEalJPtbGi9NX7DM372IP98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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