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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ff4e79ac10f82c0e47a655b33f5d0f7ced9edc3c89a0914473907d1eb6d4e71' 
  AND token = 'JrpPoh2Vr74c800lgBXC1skMj6VXcXUeUYuV2JLIbf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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