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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77bdcdc6fc22a779883ec7dc50d05bdc0dd3588212fa775ee8c1ef5c6982adf8' 
  AND token = 'AeOK5hudd6PU2Kv807rir+Ex520M423deeogUJZyoLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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