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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f1cd8b85b84d5310816981d33fbeecf17882e8a948b92b7fd71911883adaea3' 
  AND token = 'Wi0lyoNjjSksFcDptjdAOmSG5A7ATikfJ9GQTF/AKv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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