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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68510c00982fb50c954d5e19bfde7c9e96bc38f9f0f69d7bd53c8446a96f3af5' 
  AND token = 'NkY5TmR3dliaBYF1uWZgA+DYn6feVSmdlEdOiS59Qo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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