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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce9cdaee01d6ef2d5b6d5ca7a04c4e7955b62ea34a37aec419c3cd591f6a81f6' 
  AND token = '4vyu6c88O+JmTzcn4RdN25L7H9D4efyoJmgDY7AgWgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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