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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a1b3d65a9d3c570572ffa9a2d7d2cc206f664c63b10032ea2685fc5ee9fd8cf' 
  AND token = 'iXoei7hvUj+ArkX5bZ650/QRLLdrDrXaE0iH52DiwKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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