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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15dd10427621f2dc75078699cbd66685bfb54ea3364eb8d4df89cf4b3ebd35ff' 
  AND token = 'hPt+mNm4+XAPks5h1BNPMkT9FBr4VHjoMLZHeenF1CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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