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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d1330aaf0944bf1704a66e5f2a8f52f19ccbe96b05a9ec1b1b732f1af555099' 
  AND token = 'IfIu7yKN/rhegsn7vKBVpqjypPpfWNkgpuyWd99fAco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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