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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aac48782562b4a0e909637ec7a2a8794ef8ac44409dbe3b7d8ac09f36faf3556' 
  AND token = '3qAucCnozUbJ44PHMOnltq77FCeq8SXIacCednRlYBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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