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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99d5a99100eb013f0a794a58dea9f3350c9b37d50d9435d4aa5682b26eeffa1d' 
  AND token = 'ej1/BiH72P/EJTpzt5jg643feoPWzSD3miDv2woa5d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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