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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ec7c3da1dbdd8ba55ef384b23699bfdb93645b4dfeafdf3926d0b1e4b0f19a2' 
  AND token = 'ms5J4MmKn9gdUdcSSvQe1V6PAFVXc2IkxD2Nk2cG4k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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