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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4de237e8b8fc6b958ccfd0db7b0d303b5b0af8da30bc793bd6763dbc48d3745' 
  AND token = 'lnNuEHB6xXJ6y+42wPlCeGAFE/49sypKn+5FHZgrQlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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