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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00df80d66e9dcd14751d4c55f5f467af2b0d8576d54c39cf0d9d32afb9c0fab8' 
  AND token = 'g0xFAVlwSVTeeqJh30pEMHb5SVBnxUTHGDTAhUpncLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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